I have no experience with that particular Gizzmo gasket, but a few friends use similar ones on their DSM's. I don't recall them having an issue with leaks, but I can ask them again. As far as having a spacer made from aluminum I don't see why not, just use two gaskets for the seal.
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Boosted Big Body On 335's
PS3 ID: Rotordad
1986 Mazda RX7 GXL - Street ported 13BT, Haltech, 62mm, ect.
2006 MazdaSpeed 6 - Eagle, Wiseco, Cobb, ect.
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